This affects at least the following tests in the svg/ subdirectory (taken from LayoutTests/platform/mac-sonoma-wk2-lbse-text/TestExpectations): svg/W3C-SVG-1.1/masking-mask-01-b.svg [ ImageOnlyFailure ] svg/custom/absolute-sized-content-with-resources.xhtml [ Failure ] svg/custom/empty-mask.svg [ Failure ] svg/custom/hidpi-masking-clipping.svg [ ImageOnlyFailure ] svg/custom/js-late-mask-and-object-creation.svg [ Failure ] svg/custom/js-late-mask-creation.svg [ Failure ] svg/custom/local-url-reference-mask.html [ ImageOnlyFailure ] svg/custom/mask-changes.svg [ Failure ] svg/custom/mask-child-changes.svg [ Failure ] svg/custom/mask-colorspace.svg [ Failure ] svg/custom/mask-excessive-malloc.svg [ Failure ] svg/custom/mask-inside-defs.svg [ Failure ] svg/custom/mask-invalidation.svg [ Failure ] svg/custom/mask-on-multiple-objects.svg [ Failure ] svg/custom/mask-with-all-units.svg [ Failure ] svg/custom/mask-with-default-value.svg [ Failure ] svg/custom/recursive-mask.svg [ Failure ] svg/custom/visibility-override-mask.svg [ Failure ] svg/foreignObject/mask.html [ ImageOnlyFailure ] svg/masking/mask-negative-scale.svg [ ImageOnlyFailure ] svg/masking/mask-transformed-text-missing.svg [ ImageOnlyFailure ] svg/masking/mask-type-alpha.svg [ ImageOnlyFailure ] svg/masking/mask-type-luminance.svg [ ImageOnlyFailure ] svg/masking/mask-type-not-set.svg [ ImageOnlyFailure ] svg/repaint/mask-clip-target-transform.svg [ ImageOnlyFailure ] svg/repaint/text-mask-update.svg [ ImageOnlyFailure ] svg/transforms/text-with-mask-with-svg-transform.svg [ Failure ] svg/zoom/page/zoom-mask-with-percentages.svg [ Failure ]
<rdar://problem/118834347>
Preliminary masking support is available in LBSE.